Abstract
Twenty Sprague-Dawley rats, 8 females and 12 males, were run 100 trials with a buzzer or tone CS for 10 consecutive days in a wheel turn avoidance apparatus. About 50% of the Ss showed a decrement in avoidance performance with continued training. CS and sex variables did not systematically affect the decrement phenomenon. Non-decrementing Ss displayed higher avoidance performance then decrementers both within and between sessions. No significant difference in warm-up magnitude between decrementers and non-decre-menters was found. These data are interpreted as indicating the learning of a competing CER (freeze) response to the CS which may produce the decrement phenomenon.
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